OpenSPG/openspg ? reverse-engineered prompt

Build me an open source knowledge graph engine for enterprise use, similar to OpenSPG, where people can model a domain with clear semantics, load both structured and unstructured data, and then run logical reasoning over it. I want it to support a clean way to define entities, relationships, and rules, plus a builder flow that can turn raw data into knowledge and keep improving the graph over time.

It should also be designed so it can plug into different storage and compute backends, and it should leave room for LLM based knowledge extraction and question answering later. Please include a simple way to run it locally, a few example domain models, and basic docs that show how to get started with a supply chain or risk style knowledge graph. If you need to look up current docs or patterns online, go ahead and use them.